If its close, its £1.70, if it's a but further, its £2.50 on first bus. McGills charge you £4.70 and you can get an all day ticket (which is also a return) for £4.70 too, first bus or mcgills. Get the app its £4.60 or £4 for student fare. I may be wrong/missing stuff. Moved here 6 months ago